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PHP Image Upload Function.

<?php
//Celox Systems LLC 2008
function upload_img($width_arg, $heigh_arg, $path, $sampling = true){
   $upload = 1;
   $filename = strtolower($_FILES['userfile']['name']);

$ext = split("[/\.]", $filename);
   $n = count($ext)-1;
   $ext = $ext[$n];

if($ext=='jpg' || $ext=='jpeg' || $ext=='gif' || $ext=='png'){
      $filepath = $path.$filename;  // the $path peram should be like "myfolder/"
   }
   else{
      $upload = -1;
   }
   if($upload == 1){
      $max_width = $width_arg;
      $max_heigh = $heigh_arg;
      list($width, $height) = getimagesize($_FILES['userfile']['tmp_name']);
      $newwidth = $width;
      $newheight = $height;
      if($width > $max_width || $height > $max_heigh){
         if($width > $height){
            $percent = $max_width / $width;
            $newwidth = $width * $percent;
            $newheight = $height * $percent;
         }
         else{
            $percent = $max_heigh / $height;
            $newwidth = $width * $percent;
            $newheight = $height * $percent;
         }

}
         $thumb = imagecreatetruecolor($newwidth, $newheight);

if($ext=='jpg' || $ext=='jpeg')
            $source = imagecreatefromjpeg($_FILES['userfile']['tmp_name']);
         if($ext=='gif')
            $source = imagecreatefromgif($_FILES['userfile']['tmp_name']);
         if($ext=='png')
            $source = imagecreatefrompng($_FILES['userfile']['tmp_name']);

//Resize
         if($sampling = true)
            imagecopyresampled($thumb, $source, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);
         else
            imagecopyresized($thumb, $source, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);
         if($ext=='jpg' || $ext=='jpeg')
            return imagejpeg($thumb,$filepath);
         if($ext=='gif')
            return imagegif($thumb,$filepath);
         if($ext=='png')
            return imagepng($thumb,$filepath);
      }
      return $upload;
}
if(isset($_FILES['userfile']['name'])){
   $photo = upload_img(800, 800, "user_img/");
   unset($_FILES['userfile']['name']);
}
else{
   $photo = NULL;
}
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">

<head>
<title>Upload Image</title>
   <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"/>
   <style type="text/css">
   /*<![CDATA[*/
      body{
        background-color: #006699;
        margin-top: 75px;
        font-family: Arial, "lucida console", sans-serif;
      }

#main{
        width: 250px;
        padding: 25px;
        background-color: #C2E4E1;
        border: solid;
        border-width: 5px;
        border-color: #FFFFFF;
        margin: auto;
      }

/*]]>*/
   </style>
</head>

<body>
   <div id="main">
   <?php

if($photo == 1)
            print"Image Uploaded, send anouther? <br />";
         else if($photo == -1)
            print"Image must be jpg, jpeg, gif or png";
         print"<form enctype='multipart/form-data' action='#' method='POST'>";
         print"<input type='hidden' name='MAX_FILE_SIZE' value='90000000' />";
         print"Select file:<br />";
         print"<input name='userfile' type='file' /><br /><br />";
         print"<input type='submit' value='Upload' />";
         print"</form>";
         $photo = 0;
   ?>
   <a href="index.html">Exit</a>
   </div>
</body>

</html>